以下为句子列表：
英文: A flock of Bulgarian circus doves was barred from returning home on Thursday because of an outbreak of avian flu in Turkey.
中文: 由于土耳其近日发现禽流感疫情，正在该国巡演的保加利亚某马戏团内的一群鸽子于10月13日被有关部门禁止返回祖国。
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英文: Avian flu has killed or forced the slaughter of millions of birds over the last two years.
中文: 禽流感在过去两年来已导致数百万家禽被宰杀。
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英文: Avian flu is probably here to stay, experts are warning Europe's governments.
中文: 专家警告欧洲各国政府：禽流感很可能会留下来。
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英文: Avian flu viruses have demonstrated an ability to evolve to easily infect humans by exchanging genes with human viruses that subsequently permit them to recognise human receptor molecules and gain easy access to cells, typically in the human respiratory s
中文: 禽流感病毒可通过与人类基因交换进化，进而能够识别人类细胞受体，获得进入细胞通道，尤其是人类呼吸通道，最终呈现易感染人的能力。
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英文: China has reported another mass outbreak of avian flu in a flock of birds - the third such incident in the past eight days.
中文: 中国在8天内第3次报告禽鸟中发生了大规模禽流感疫情。
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